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Usage of specialized fence-gaps in a black rhinoceros conservancy in Kenya

Fencing is increasingly used in wildlife conservation. Keeping wildlife segregated from local communities, while permitting wildlife access to the greater landscape matrix is a complex task. We investigated the effectiveness of specially designed fence-gaps on animal movement at a Kenyan rhinoceros conservancy, using camera-traps over a four-year period. The fence-gap design restricted the movement of black (Diceris bicornis) and white rhinoceroses (Ceratotherium simum simum) but permitted the movement of other species. We documented over 6000 crossing events of over 50

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Metric Learning Based Pattern Matching For Species Agnostic Animal Re-Identification

In the active effort to monitor and protect endangered animal species, modern technology is replacing the previously used conventional techniques of tracking using GPS or tagging which are considered invasive in nature. The non-invasive technology such as camera traps collects a large amount of data remotely, enabling the use of computer vision techniques to perform the analysis including re-identification of animal individuals. The re-identification of the animal individuals can be done by training a convolutional neural network to measure the

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Giraffe bed and breakfast: Camera traps reveal Tanzanian yellow-billed oxpeckers roosting on their large mammalian hosts

Oxpeckers are obligate mammal gleaners, feeding on ectoparasites and dead skin of large herbivores (Bezuidenhout & Stutterheim, 1980; Dean & MacDonald, 1981). There are two sympatric species in sub-Saharan Africa: the red-billed (Buphagus erythrorhynus) and yellow-billed oxpeckers (Buphagus africana). The red-billed species is smaller, with a scissor-like bill, while the yellow-billed species is larger, behaviourally dominant, and has a broad, flat beak (Attwell, 1966; Neweklowsky, 1974; Stutterheim, Bezuidenhout, & Elliott, 1988). These behavioural and morphological attributes are hypothesized to contribute

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Quantifying the severity of giraffe skin disease via photogrammetry analysis of camera trap data

Developing techniques to quantify the spread and severity of diseases afflicting wildlife populations is important for disease ecology, animal ecology, and conservation. Giraffes (Giraffa camelopardalis) are in the midst of a dramatic decline, but it is not known whether disease is playing an important role in the broad-scale population reductions. A skin disorder referred to as giraffe skin disease (GSD) was recorded in 1995 in one giraffe population in Uganda. Since then, GSD has been detected in 13 populations in

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